Gary,
First of all you really need to think what do you wnt, R or D. If you decide to R then you need to discover if you can make it, some people can other can not, as seems is your case so far.
Does she have any protection network, family, parents, etc, that can support her in case you decide to walk away?
Maybe this is against what other have being telling; this is just my opinion:
Maybe she just doesn’t know how to help you, maybe she needs some directions. I believe she has taken you for granted and now doesn’t know how to react as you did everything for her before, I believe she is affair of 2 things, that everything is going to change and is starting to fear that you may actually leave her.
IMO you should develop a plan, something like this.
1.- She needs to find a job ASAP, why? because you can drop your second job and if you D she will have means to survive and less alimony you will pay. She needs a real job, not that 3 day thing, part time will make it.
2.- She needs to share house work 50%-50% no excuse. This way you will have more time to yourself and the son also she will appreciate all you did for her and realize what she thrown away.
3.- You need to go away a few days, just to let her do all things in home. Left some money, just for the basics, you don’t want to starve them, but there is not need for her to use your money to do Volumtering and money to fun things while she is not working.
4.- All her friends that knew, not just the one that supported her in the Affair, needs to be gone like yesterday. If her parents or any other relative knew they must be gone as well. This is not to punish her, this is for her to understand the consequences of her actions, keeping that relations are emasculating you.
5.- Voluntering is gone, at least for the near future. No matter if she is in the middle of something. This must be over.
6.- IDK if she already did this but she needs to take a STD test and also a polly test. This way she knows how deep she risked not just her life, but your. Also the poly is for her to understand that a lot of work will be needed to build back your trust.
Look, I know that some of these points are not fair, but all of them are meant to open her eyes of what she has taken for granted and thrown away, as well to protect you. Also what she has done, the Affair and after Dday, are less than fair.
She needs a lot to learn and undertand.
Good luck